You can use either the original or the remake redesign version of the characters for each game, and Hisui is different from Sinnoh

Hisui > Unova > Galar > Kalos > Kanto > Johto > Hoenn > Sinnoh > Alola > Paldea

Hisui's combo of Arezu, Mai, Irida, Cogita and Karen's ancestor is the winner by far
Sinnoh has surpringly few hot woman (Cynthia and the Arcanine girl were the only ones I thought of honestly)